/** Max stored data-URL length — avoids corrupt JPEGs from mid-string truncation in JSONL. */
export declare const MAX_SNAPSHOT_DATA_URL_LENGTH = 96000;
export declare function dropOversizeSnapshot(snapshot?: string | null): string | undefined;
/** Shrink JPEG data URLs by lowering quality and dimensions until they fit storage limits. */
export declare function compressDataUrlForStorage(dataUrl: string, maxChars?: number): Promise<string | null>;
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